Tension of Belts.
make a constant angle with the radii, and if the angles cr are taken
small, the construction is fairly correct. But greater accuracy is
secured by using the equation to the curve,
where e = 2718, the base of Napieran logarithms.
More usefully the formula becomes
/ (See Appendix //.,
•«43 M- /867.)
Then, the log. being known, the corresponding number is
found from a table, and the formula used for any value of
-, even beyond 360°.
COEFFICIENT OF FRICTION (/*) IN TENSION ELEMENTS.
Leather belting" on iron pullies .........
"\ to *A
i "5 if oily
• Wire rope or^iron pullies ...............
'Wire rope 0n leather-bottomed pullies Hemp rope on jbron pullies ....... .....
•25 '28 to *i8
) not accounting > for wedge \ action